Lock



L. ALBERTI Dec. 17, 1935.

LOCK

Filed July 2, 1954 gin/vanto@ Hummm i W11* Il l l l l Patented Dec. 17,1935 UNITED STATES ATENT QFFIE LOCK I Luis Alberti, Buenos Aires,Argentina Application July 2, 1934, Serial N0. 733,514 2 claims. (Ci.711-47) This invention refers to locks, both for room doors and the likewhich are actuated indifferently from either side of the door and fordoors of closets, safeboxes and the like which are actuated from onlyone side. This new lock is simple in construction, operates easily andprovides substantially an absolute safeguard against violation.

The invention is illustrated in the accompanying drawing, in which-Figure 1 is a View, partly in section and partly in elevation, of a lockhaving the invention applied thereto,

Figure 2 is a section on the line 2-2 of Figure 1, Y

Figure V3 is an enlarged longitudinal section through the lockingmechanism of the invention,

Figure 4 is a detail view similar to Figure 3 and showing a diiferentposition of the parts at the inner end of the lock.

Referring in detail to the drawing, I is the key, 2 is the exteriorhandle, of any approved form, of a roll-back shaft 3 which passesthrough the whole locking mechanism and which at its interior end, isprovided. with a roll-back arm I2 which actuates the lock bolt I3.

The lock includes a metal block 4 which is preferably circular in crosssection and has an opening extending from end to end thereof through itsupper portion and in which the roll-back shaft 3 is mounted to rock orrotate. The rollback shaft has a circumferential notch or socket 5 at ornear its inner or rear end and contains a plurality of radialperforations 6.

These perforations 6 are continuedalong both sides of the roll-backshaft into the block 4, so that they form complete channels which extendfrom one side of the block 4, through the bar 3, to end at the otherside of the block 4 where will be found the open longitudinal space orkey slot l,

provided for the introduction of the key I.

At the end which is most remote from the open longitudinal key slot 1,each perforation houses ak spring 8 bearing upon a pin segment 9 which,when spring 8 is closed, will reach exactly to the part crossed by theroll-back shaft 3. The part of the perforation which passes through therollback shaft 3, contains a pin segment Ill, and a third pin segment Iloccupies the rest of the perforation, viz. the portion between therollback shaft 3 and the open longitudinal space or keyhole 1. Thelatter segments II are of different lengths relative to the perforationwhich they respectively occupy between the roll-back shaft 3 and theopen longitudinal space or keyhole 1, and the walls of this space or keyslot are grooved or ribbed longitudinally to correspond to the crosssection of the key and the edge of the key is serrated or notched topresent an outline mating with the outline presented by the projectingends of the series of pins.

As will be understood, when the key I is withdrawn from the keyhole l,there is a cessation of the pressure which said key exerted through thepin segments 9, IU, I I upon the springs 8. Springs 8, therefore, willnow push pin segments 9 towards the open longitudinal space or keyholel, causing them to enter partially into the perforations of theroll-back shaft which up to now had been occupied solely by segments I0,and causing the pin segments I to enter partially into the continuationsof said perforations in block 4, the pin segments I I in turn beingprojected partially into the key slot l. As the ends 'of the pinsegments are now no longer in line with the circumference of theroll-back shaft 3, the bar will be held against turning and the lockcannot be opened.

When the key is again inserted in the key slot, the pin segments II willbe pushed back into Vthe interior of the perforations, they will pushupwards the segments Il) and these in turn will push segments 9 theselatter segments nally will press against springs 8 and the ends of thesegments again will be in line with the circumference of the roll-backshaft 3 which thus will be enabled to turn.

However, the alinement of pin segments 9, I0, II with the roll-backshaft will not alone permit rotary movement of the bar. 'Ihere is stillanother safety device which impedes it. Indeed, it was said before thatthe roll-back shaft 3 has a groove 5, and in passing also may bementioned set screw 23 which is mounted in the upper portion of theblock 4 and projects into another annular groove 24 on the roll-backshaft 3 with the purpose of safeguarding the shaft 3 against movementsin a longitudinal direction. Groove or socket 5 forms only a hole whichis .alined with a groove or recess in the block in which is slidablymounted a pin 20 beneath which is a spring 2I, and near its lower end arecess or notch 22 is formed in the pin 20 to be engaged by the taperedpoint of the key. Normally, when the key is not in the lock, the head orsuperior end of pin 2i) enters into groove 5 of the roll-back shaft 3,as spring 2| pushes pin 20 upwards. In this position, the recess 22remains so high that, when the key arrives at the pin, its point touchesthe lowest part of the recess, and as the key progresses, the inclinededge face of its point draws pin 2l) downwards, withdrawing its headfrom socket of roll-back shaft 3. It is, therefore, necessary that thepoint of key I enters into recess 22 of pin 20, so as to exercise apressure which acts upon spring 2l .and produces the descent of pin 20,the head of which is thus withdrawn from the socket 5, placing theroll-back shaft 3 into condition to turn. This construction offers animportant additional device to augment the security of the lock.

As will have been seen, the purpose of key I is only to enable, by meansof its introduction into keyhole 1, the roll-back shaft 3 to turn,Whereas the key itself remains stationary. After inserting the key, arotary movement can be given to the roll-back shaft 3 by means of itshandle 2, whereby arm I2 provided at the interior end of the roll-backshaft 3 will turn also. During its rotary or rocking movement theroll-back arm I2 will lift the tumbler I4 against the force of ,a springI5 which bears upon the upper edge of the tumbler to yieldably hold itin its lowered normal position. The arm I2 then engages a notch I6 inthe upper wall of an opening or slot in the bolt I3 so as to partlyretract the bolt, and during a second revolution the arm I2 will engagea second notch I1 in said wall, thereby fully retracting the bolt sothat the door may be opened. These notches I6 and I1 of the lock bolt 3and cooperating elements are in double systems, used for room doors andothers which are to be actuated indiierently from one side or the other,within reach of the roll-back arm I2 of each one of the two mechanisms,and this will be seen when looking at Figure 2 where lock bolt I3occupies the central part anked by the two mechanisms which, on doorswhich are to be actuated from one side only, will be reduced to onemechanism; as will be understood.

The door may be provided With'the usual latch bolt indicated at I8.

Although the locking device has been described and illustratedparticularly with reference to room doors actuated from both sides, itis to be understood that the invention is not limited to this use whichhas been chosen to show the device in its most complicated form. Thedevice, in a. more primitive form of construction, viz.: using a singlemechanism, can be employed for all kinds of Yclosure devices, whereverfastening means are to be applied. The invention can be used for 5padlocks, for fastening motor cars, the curtains of show-windows,closure doors of closets, safe boxes and, finally, all objects, doors oropenings which are to be locked by means of a locking system.

What I claim as my invention, and desire to 10 secure by Letters Patent,is as follows:

l. A locking device comprising a block having .an opening extendingthrough its upper portion from end to end thereof and a key slot in itslower portion parallel with said opening, a rollback shaft mounted insaid opening and having a socket in its circumferential surface at itsinner end, tripartite pins mounted in the block and the shaft andoperable by an inserted key, a latch bolt slidably mounted in the blockat the inner end thereof to engage the socket in the shaft, said latchbolt having a recess in its lower portion presented to the key slot, andyieldable means for holding said latch bolt in an upper position, therecess being engaged by the tapered end of an inserted key to draw thelatch bolt from the shaft.

2. A locking device comprising a block having an opening formedtherethrough and a key slot parallel with said opening, a roll-backshaft mounted in said opening and adjacent its inner end having a socketin its circumferential surface, tripartite pins mounted in the block andthe shaft and operable by an inserted key, a latch bolt slidably mountedin the block and movable radially of the shaft into and out of positionto engage in the socket in the shaft, said latch bolt having a seatpresented to the key slot and formed with a cam surface, and yieldablemeans for holding said latch'bolt in position to enter the socket of theshaft, the cam surface being engaged by the end of the inserted key tomove the latch bolt away from the shaft.

LUIS ALBERTI.

